# CAMERA LENS GROUP

A camera lens group is disclosed. The camera lens group includes, sequentially from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers. The second lens has a positive refractive power. An object-side surface of the second lens, an object-side surface of the third lens, and an object-side surface of the sixth lens are a convex surface. An image-side surface of the third lens, an image-side surface of the sixth lens, and an image-side surface of the seventh lens are a concave surface. A center thickness CT4 of the fourth lens on the optical axis and a center thickness CT5 of the fifth lens on the optical axis satisfy: CT4/CT5>1.5.

**Description**

**CROSS-REFERENCE TO RELATED APPLICATIONS**

This disclosure is a continuation of International Application PCT/CN2018/085638, with an international filing date of May 4, 2018, which claims priority to Chinese Patent Application No. 201710860093.9, filed with the China National Intellectual Property Administration (CNIPA) on Sep. 21, 2017, and Chinese Patent Application No. 201721215393.3, filed with the China National Intellectual Property Administration (CNIPA) on Sep. 21, 2017, the contents of which are incorporated herein by reference in their entirety.

**TECHNICAL FIELD**

The present disclosure relates to a camera lens group, and more specifically to a camera lens group including seven lenses.

**BACKGROUND**

With the miniaturization trend of portable electronic products, requirements on ultra-thin and miniaturization of the counterpart camera lens groups have been brought forward. At the same time, with the popularization of portable electronic products such as mobile phones and tablet computers, the counterpart camera lens groups not only need to have good imaging quality in situations such as in daylight or sufficient lighting, but also need to have good imaging quality in situations such as insufficient lighting (e.g., on cloudy days, or at dusk). In this case, it puts corresponding requirements on aspects such as high-pixel, high resolution, brightness of the image plane, and aperture of the camera lens groups.

**SUMMARY**

The present disclosure provides a camera lens group such as a camera lens group having a large aperture, which may be applicable to portable electronic products and may at least or partially solve at least one of the above disadvantages in the existing technology.

According to an aspect, the present disclosure provides a camera lens group. The camera lens group includes, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers. The second lens may have a positive refractive power, and an object-side surface of the second lens may be a convex surface. An object-side surface of the third lens may be a convex surface, and an image-side surface of the third lens may be a concave surface. An object-side surface of the sixth lens may be a convex surface, and an image-side surface of the sixth lens may be a concave surface. An image-side surface of the seventh lens may be a concave surface. A center thickness CT**4** of the fourth lens on the optical axis and a center thickness CT**5** of the fifth lens on the optical axis may satisfy: CT**4**/CT**5**>1.5.

In an implementation, a total effective focal length f of the camera lens group and an entrance pupil diameter EPD of the camera lens group may satisfy: f/EPD≤1.65.

In an implementation, an effective focal length f**2** of the second lens and the total effective focal length f of the camera lens group may satisfy: 0.5<f**2**/f<1.5.

In an implementation, an effective focal length f**4** of the fourth lens and an effective focal length f**6** of the sixth lens may satisfy: 0.5<f**4**/f**6**<2.

In an implementation, the seventh lens may have a negative refractive power, and an effective focal length f**7** of the seventh lens and an effective focal length f**2** of the second lens may satisfy: −1.5<f**7**/f**2**<−0.5.

In an implementation, a radius of curvature R**6** of the image-side surface of the third lens and a radius of curvature R**4** of an image-side surface of the second lens may satisfy: −0.5<R**6**/R**4**<0.8.

In an implementation, a radius of curvature R**7** of an object-side surface of the fourth lens and a radius of curvature R**8** of an image-side surface of the fourth lens may satisfy: 0<(R**7**+R**8**)/(R**7**−R**8**)≤1.5.

In an implementation, a total effective focal length f of the camera lens group and a radius of curvature R**9** of an object-side surface of the fifth lens may satisfy: −3.5<f/R**9**<0.5.

In an implementation, an effective focal length f**5** of the fifth lens and a radius of curvature R**10** of an image-side surface of the fifth lens may satisfy: −2<f**5**/R**10**<22.

In an implementation, a radius of curvature R**11** of the object-side surface of the sixth lens and a radius of curvature R**12** of the image-side surface of the sixth lens may satisfy: 1.5<|R**11**+R**12**|/|R**11**−R**12**|<3.5.

In an implementation, a radius of curvature R**12** of the image-side surface of the sixth lens and a radius of curvature R**11** of the object-side surface of the sixth lens may satisfy: 1.5<R**12**/R**11**<4.0.

In an implementation, a spacing distance T**67** between the sixth lens and the seventh lens on the optical axis and a spacing distance T**56** between the fifth lens and the sixth lens on the optical axis may satisfy: 4<T**67**/T**56**<14.

In an implementation, a sum of center thickness ΣCT of each of the first lens to the seventh lens on the optical axis and an axial distance TTL from an object-side surface of the first lens to an image plane of the camera lens group may satisfy: 0.5≤ΣCT/TTL≤0.7.

In an implementation, an axial distance TTL from an object-side surface of the first lens to an image plane of the camera lens group and half of a diagonal length ImgH of an effective pixel area on the image plane of the camera lens group may satisfy: TTL/ImgH≤1.60.

According to another aspect, the present disclosure further provides a camera lens group. The camera lens group includes, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers. An object-side surface of the second lens may be a convex surface. An object-side surface of the third lens may be a convex surface, and an image-side surface of the third lens may be a concave surface. An object-side surface of the sixth lens may be a convex surface, and an image-side surface of the sixth lens may be a concave surface. An image-side surface of the seventh lens may be a concave surface. An effective focal length f**4** of the fourth lens and an effective focal length f**6** of the sixth lens may satisfy: 0.5<f**4**/f**6**<2.

In an implementation, the second lens may have a positive refractive power.

In an implementation, the fourth lens and the sixth lens may both have positive refractive powers.

According to another aspect, the present disclosure further provides a camera lens group. The camera lens group includes, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers. The second lens may have a positive refractive power, and an object-side surface of the second lens may be a convex surface. An object-side surface of the third lens may be a convex surface, and an image-side surface of the third lens may be a concave surface. An object-side surface of the sixth lens may be a convex surface, and an image-side surface of the sixth lens may be a concave surface. An image-side surface of the seventh lens may be a concave surface. An effective focal length f**2** of the second lens and a total effective focal length f of the camera lens group may satisfy: 0.5<f**2**/f<1.5.

According to another aspect, the present disclosure further provides a camera lens group. The camera lens group includes, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers. The second lens may have a positive refractive power, and an object-side surface of the second lens may be a convex surface. An object-side surface of the third lens may be a convex surface, and an image-side surface of the third lens may be a concave surface. An object-side surface of the sixth lens may be a convex surface, and an image-side surface of the sixth lens may be a concave surface. An image-side surface of the seventh lens may be a concave surface. A spacing distance T**67** between the sixth lens and the seventh lens on the optical axis and a spacing distance T**56** between the fifth lens and the sixth lens on the optical axis may satisfy: 4<T**67**/T**56**<14.

According to another aspect, the present disclosure further provides a camera lens group. The camera lens group includes, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers. The second lens may have a positive refractive power, and an object-side surface of the second lens may be a convex surface. An object-side surface of the third lens may be a convex surface, and an image-side surface of the third lens may be a concave surface. An object-side surface of the sixth lens may be a convex surface, and an image-side surface of the sixth lens may be a concave surface. The seventh lens may have a negative refractive power, and an image-side surface of the seventh lens may be a concave surface. An effective focal length f**7** of the seventh lens and an effective focal length f**2** of the second lens may satisfy: −1.5<f**7**/f**2**<−0.5.

According to another aspect, the present disclosure further provides a camera lens group. The camera lens group includes, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers.

The second lens may have a positive refractive power, and an object-side surface of the second lens may be a convex surface. An object-side surface of the third lens may be a convex surface, and an image-side surface of the third lens may be a concave surface. An object-side surface of the sixth lens may be a convex surface, and an image-side surface of the sixth lens may be a concave surface. An image-side surface of the seventh lens may be a concave surface. A radius of curvature R**12** of the image-side surface of the sixth lens and a radius of curvature R**11** of the object-side surface of the sixth lens may satisfy: 1.5<R**12**/R**11**<4.0.

According to another aspect, the present disclosure further provides a camera lens group. The camera lens group includes, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers. The second lens may have a positive refractive power, and an object-side surface of the second lens may be a convex surface. An object-side surface of the third lens may be a convex surface, and an image-side surface of the third lens may be a concave surface. An object-side surface of the sixth lens may be a convex surface, and an image-side surface of the sixth lens may be a concave surface. An image-side surface of the seventh lens may be a concave surface. An axial distance TTL from an object-side surface of the first lens to an image plane of the camera lens group and half of a diagonal length ImgH of an effective pixel area on the image plane of the camera lens group may satisfy: TTL/ImgH≤1.60.

In the present disclosure, multiple lenses (e.g., seven lenses) are used. By reasonably configuring the refractive powers and the surface types of the lenses, the center thicknesses of the lenses and the spacing distances between the lenses, etc., the camera lens group has an advantage of large-aperture, the relative brightness on the image plane is enhanced, and the imaging effect in situations such as insufficient lighting improves. Meanwhile, the camera lens group with the above configuration may further have at least one of the beneficial effects: ultra-thin, miniaturization, large-aperture, low susceptibility, good processability, high imaging quality, or wide-angle.

**BRIEF DESCRIPTION OF THE DRAWINGS**

After reading detailed descriptions of non-limiting implementations with reference to the accompanying drawings, other features, objectives and advantages of the present disclosure will become more apparent. In the accompanying drawings:

**DETAILED DESCRIPTION OF EMBODIMENTS**

For a better understanding of the present disclosure, various aspects of the present disclosure will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely an illustration for the illustrative implementations of the present disclosure rather than a limitation to the scope of the present disclosure in any way. Throughout the specification, the same reference numerals designate the same elements. The expression “and/or” includes any and all combinations of one or more of the associated listed items.

It should be noted that in the specification, the expressions, such as “first,” “second,” and “third” are only used to distinguish one feature from another, rather than represent any limitations to the feature. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present disclosure.

In the accompanying drawings, the thicknesses, sizes, and shapes of the lenses have been slightly exaggerated for the convenience of explanation. Specifically, shapes of spherical surfaces or aspheric surfaces shown in the accompanying drawings are shown by examples. That is, shapes of the spherical surfaces or the aspheric surfaces are not limited to the shapes of the spherical surfaces or the aspheric surfaces shown in the accompanying drawings. The accompanying drawings are merely illustrative and not strictly drawn to scale.

Herein, the paraxial area refers to an area near the optical axis. If a surface of a lens is a convex surface and a position of the convex surface is not defined, it indicates that the surface of the lens is a convex surface at least in the paraxial area. If a surface of a lens is a concave surface and a position of the concave surface is not defined, it indicates that the surface of the lens is a concave surface at least in the paraxial area. The surface closest to the object in each lens is referred to as the object-side surface, and the surface closest to the image plane in each lens is referred to as the image-side surface.

It should be further understood that the terms “comprising,” “including,” “having” and variants thereof, when used in the specification, specify the presence of stated features, elements, or components, but do not exclude the presence or addition of one or more other features, elements, components, or combinations thereof. In addition, expressions, such as “at least one of,” when preceding a list of listed features, modify the entire list of features rather than an individual element in the list. Further, the use of “may,” when describing the implementations of the present disclosure, relates to “one or more implementations of the present disclosure.” Also, the term “illustrative” is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. It should be further understood that terms (i.e., those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should also be noted that the embodiments in the present disclosure and the features in the embodiments may be combined with each other on a non-conflict basis. The present disclosure will be described below in detail with reference to the accompanying drawings and in combination with the embodiments.

Features, principles, and other aspects of the present disclosure are described below in detail.

A camera lens group according to illustrative implementations of the present disclosure includes, for example, seven lenses (i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens) having refractive powers. The seven lenses are sequentially arranged from the object side to the image side along the optical axis.

In the illustrative implementations, the camera lens group may include: the first lens having a refractive power; the second lens having a positive refractive power, and an object-side surface of the second lens is a convex surface; a third lens having a refractive power, an object-side surface of the third lens is a convex surface, and an image-side surface of the third lens is a concave surface; the fourth lens having a refractive power; the fifth lens having a refractive power; the sixth lens having a refractive power, an object-side surface of the sixth lens is a convex surface, and an image-side surface of the sixth lens is a concave surface; and the seventh lens having a refractive power, and an image-side surface of the seventh lens is a concave surface.

In an implementation, the first lens may have a negative refractive power; the second lens may have a positive refractive power; the third lens may have a positive refractive power; the fourth lens may have a positive refractive power; the fifth lens may have a negative refractive power; the sixth lens may have a positive refractive power; and the seventh lens may have a negative refractive power.

In an implementation, the first lens may have a negative refractive power; the second lens may have a positive refractive power; the third lens may have a negative refractive power; the fourth lens may have a positive refractive power; the fifth lens may have a negative refractive power; the sixth lens may have a positive refractive power; and the seventh lens may have a negative refractive power.

In an implementation, the first lens may have a positive refractive power; the second lens may have a positive refractive power; the third lens may have a negative refractive power; the fourth lens may have a positive refractive power; the fifth lens may have a negative refractive power; the sixth lens may have a positive refractive power; and the seventh lens may have a negative refractive power.

The second lens may have a positive refractive power, an effective focal length f**2** of the second lens and a total effective focal length f of the camera lens group may satisfy: 0.5<f**2**/f<1.5, and more specifically, f**2** and f may further satisfy: 0.80≤f**2**/f≤1.40. By controlling the positive refractive power of the second lens within a reasonable range, it is possible to effectively control aberrations related to the field-of-view such as the curvature of field and distortion, thereby improving the imaging quality.

An effective focal length f**4** of the fourth lens and an effective focal length f**6** of the sixth lens may satisfy: 0.5<f**4**/f**6**<2.0, and more specifically, f**4** and f**6** may further satisfy: 0.92≤f**4**/f**6**≤1.89. By properly configuring the refractive powers of the fourth lens and the sixth lens, aberrations of the imaging system may be effectively reduced, and the susceptibility of the imaging system may be reduced. In an illustrative embodiment, both the second lens and the fourth lens may have positive refractive powers.

An effective focal length f**7** of the seventh lens and an effective focal length f**2** of the second lens may satisfy: −1.5<f**7**/f**2**<−0.5, and more specifically, f**7** and f**2** may further satisfy: −1.21≤f**7**/f**2**≤−0.79. Properly configuring the refractive powers of the seventh lens and the second lens is beneficial to improving the optical performance of the lens assembly and obtaining a good imaging quality. In an illustrative embodiment, the second lens may have a positive refractive power and the seventh lens may have a negative refractive power.

In practice applications, the radius of curvature of each lens surface in the lens group may be optimized, and the lens group has a good optical performance by properly controlling the bending direction and bending degree of each surface.

The total effective focal length f of the camera lens group and a radius of curvature R**9** of an object-side surface of the fifth lens may satisfy: −3.5<f/R**9**<0.5, and more specifically, f and R**9** may further satisfy: −3.11≤f/R**9**≤0.01. By properly arranging the radius of curvature of the object-side surface of the fifth lens, the deflection angle of light may be controlled within a reasonable range, thereby making the imaging system easier to match with common chips.

An effective focal length f**5** of the fifth lens and a radius of curvature R**10** of an image-side surface of the fifth lens may satisfy: −2<f**5**/R**10**<22, and more specifically, f**5** and R**10** may further satisfy: −1.54≤f**5**/R**10**≤21.08. By properly arranging the radius of curvature of the image-side surface of the fifth lens, it is possible to undertake a reasonable deflection angle of light, thereby reducing primary aberrations of the imaging system. In an illustrative embodiment, the fifth lens may have a negative refractive power.

A radius of curvature R**6** of the image-side surface of the third lens and a radius of curvature R**4** of an image-side surface of the second lens may satisfy: −0.5<R**6**/R**4**<0.8, and more specifically, R**6** and R**4** may further satisfy: −0.11≤R**6**/R**4**≤0.59. By properly controlling the bending directions and bending degree of the image-side surface of the second lens and the image-side surface of the third lens, the curvature of field of the imaging system may be effectively controlled, thereby improving the imaging quality of the imaging system. Optionally, the image-side surface of the third lens may be a concave surface.

A radius of curvature R**7** of an object-side surface of the fourth lens and a radius of curvature R**8** of an image-side surface of the fourth lens may satisfy: 0<(R**7**+R**8**)/(R**7**−R**8**)≤1.5, and more specifically, R**7** and R**8** may further satisfy: 0.28≤(R**7**+R**8**)/(R**7**−R**8**)≤1.50. By properly controlling the radii of curvature of the object-side surface and the image-side surface of the fourth lens, the amount of astigmatism of the imaging system may be effectively controlled. Optionally, the fourth lens may be a lenticular lens or the fourth lens may be a meniscus lens that is convex to the image side.

A radius of curvature R**11** of the object-side surface of the sixth lens and a radius of curvature R**12** of the image-side surface of the sixth lens may satisfy: 1.5<|R**11**+R**12**|/|R**11**−R**12**|<3.5, and more specifically, R**11** and R**12** may further satisfy: 1.79≤|R**11**+R**12**|/|R**11**−R**12**|≤3.16. Alternatively, the radius of curvature R**11** of the object-side surface of the sixth lens and the radius of curvature R**12** of the image-side surface of the sixth lens may further satisfy: 1.5<R**12**/R**11**<4.0, and more specifically, R**11** and R**12** may further satisfy: 1.93≤R**12**/R**11**≤3.53. By controlling the bending directions and bending degree of the object-side surface and the image-side surface of the sixth lens, the amount of curvature of field of the imaging system is controlled, thereby realizing the correction of the overall aberration of the imaging system. Optionally, the object-side surface of the sixth lens may be a convex surface, and the image-side surface of the sixth lens may be a concave surface.

In practice applications, the center thickness of each lens and the spacing distances between the lenses may also be optimized so that the lens group has a good optical performance.

A center thickness CT**4** of the fourth lens on the optical axis and a center thickness CT**5** of the fifth lens on the optical axis may satisfy: CT**4**/CT**5**>1.5, and more specifically, CT**4** and CT**5** may further satisfy: 1.64≤CT**4**/CT**5**≤2.52. By properly arranging the center thickness CT**4** of the fourth lens and the center thickness CT**5** of the fifth lens, the imaging system may have a good ability to eliminate distortion while ensuring miniaturization, thereby improving the imaging quality of the imaging system.

A sum of center thickness ΣCT of each of the lenses having refractive powers on the optical axis and an axial distance TTL from the center of an object-side surface of the first lens to an image plane of the camera lens group may satisfy: 0.5≤ΣCT/TTL≤0.7, and more specifically, ΣCT and TTL may further satisfy: 0.55≤ΣCT/TTL≤0.60. By properly arranging the center thickness of each lens, it is advantageous to the imaging system in obtaining a better imaging quality. In addition, the proper distribution of the center thickness of each lens also contributes to the stability of the lens group assembly. In a camera lens group including seven lenses having refractive powers, ΣCT=CT**1**+CT**2**+CT**3**+CT**4**+CT**5**+CT**6**+CT**7**. Here, CT**1** is the center thickness of the first lens on the optical axis, CT**2** is the center thickness of the second lens on the optical axis, CT**3** is the center thickness of the third lens on the optical axis, CT**4** is the center thickness of the fourth lens on the optical axis, CT**5** is the center thickness of the fifth lens on the optical axis, CT**6** is the center thickness of the sixth lens on the optical axis, and CT**7** is the center thickness of the seventh lens on the optical axis.

A spacing distance T**67** between the sixth lens and the seventh lens on the optical axis and a spacing distance T**56** between the fifth lens and the sixth lens on the optical axis may satisfy: 4<T**67**/T**56**<14, and more specifically, T**67** and T**56** may further satisfy: 4.36≤T**67**/T**56**≤13.77. Properly configuring the spacing distances between the lenses may effectively compress the longitudinal dimension of the imaging system and realize the ultra-thin characteristic of the imaging system.

The axial distance TTL from the center of the object-side surface of the first lens to the image plane of the camera lens group and half of a diagonal length ImgH of an effective pixel area on the image plane of the camera lens group may satisfy: TTL/ImgH≤1.60, and more specifically, TTL and ImgH may further satisfy: 1.40≤TTL/ImgH≤1.55. By controlling the ratio of the total track length to the image height of the lens assembly, the size of the imaging system may be effectively compressed to achieve the ultra-thin characteristic and miniaturization of the camera lens group, so that the camera lens group may be suitably applied to a system of a limited size such as a portable electronic product.

The total effective focal length f of the camera lens group and an entrance pupil diameter EPD of the camera lens group may satisfy: f/EPD≤1.65, and more specifically, f and EPD may further satisfy: 1.54≤f/EPD≤1.65. The smaller the aperture number Fno of the camera lens group is (that is, the total effective focal length f of the lens group/the entrance pupil diameter EPD of the lens group), the larger the aperture of the lens group is, and the larger the amount of light entered in an identical unit time is. The reduction of the aperture number Fno may effectively enhance the brightness of the image plane, so that the lens group may better satisfy the shooting requirements when the lighting is insufficient, such as in cloudy days or at dusk. The lens group is configured to satisfy the conditional expression f/EPD≤1.65, which may make the lens group have an advantage of large aperture in the process of increasing the amount of light admitted, and enhance the relative illumination of the image plane, thereby reducing aberrations of the edge field while improving the imaging effect of the lens group in a dark environment.

In the illustrative implementations, the camera lens group may be further provided with at least one diaphragm to improve the imaging quality of the lens assembly. The diaphragm may be disposed between the first lens and the second lens.

Optionally, the camera lens group may further include at least one of an optical filter for correcting color deviations or a protective glass for protecting the photosensitive element on the image plane.

The camera lens group according to the above implementations of the present disclosure may use multiple lenses, for example, seven lenses as described in the preceding text. By reasonably configuring the refractive power, surface type of each lens, the center thickness of each lens and the spacing distances between the lenses, etc., the volume of the lens group may be effectively reduced, the susceptibility of the lens group may be reduced, and the processability of the lens group may be improved, which makes the camera lens group more conducive to production and processing and may be applied to portable electronic products. At the same time, the camera lens group with the above configuration also has beneficial effects such as ultra-thin, large aperture, high brightness, or high imaging quality.

In the implementations of the present disclosure, at least one of the surfaces of the each lens is an aspheric surface. The characteristic of the aspheric lens is: from the center of the lens to the periphery, the curvature continuously changes. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery, the aspheric lens has a better radius-of-curvature characteristic, having advantages of improving the distortion aberration and improving the astigmatic aberration. The use of the aspheric lens may eliminate as much as possible the aberrations that occur during the imaging, thereby improving the imaging quality.

However, it should be understood by those skilled in the art that the various results and advantages described in the present specification may be obtained by changing the number of the lenses constituting the camera lens group without departing from the technical solution claimed by the present disclosure. For example, although the camera lens group having seven lenses is described as an example in the implementations, the camera lens group is not limited to include seven lenses. If required, the camera lens group may also include other numbers of lenses.

Specific embodiments of the camera lens group that may be applied to the above implementations are further described below with reference to the accompanying drawings.

**First Embodiment**

A camera lens group according to the first embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

The first lens E**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a convex surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

The second lens E**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a concave surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

The third lens E**3** has a positive refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

The fourth lens E**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a convex surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

The fifth lens E**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a convex surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

The sixth lens E**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

The seventh lens E**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a convex surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

Optionally, the camera lens group may further include an optical filter E**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

Optionally, the camera lens group may further include a diaphragm STO disposed between the first lens E**1** and the second lens E**2**, to improve the imaging quality.

Table 1 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the first embodiment. The radius of curvature and the thickness are shown in millimeters (mm).

As may be known from Table 1, the radius of curvature R**6** of the image-side surface S**6** of the third lens E**3** and the radius of curvature R**4** of the image-side surface S**4** of the second lens E**2** satisfy: R**6**/R**4**=0.52. The radius of curvature R**7** of the object-side surface S**7** of the fourth lens E**4** and the radius of curvature R**8** of the image-side surface S**8** of the fourth lens E**4** satisfy: (R**7**+R**8**)/(R**7**−R**8**)=0.29. The radius of curvature R**11** of the object-side surface S**11** of the sixth lens E**6** and the radius of curvature R**12** of the image-side surface S**12** of the sixth lens E**6** satisfy: |R**11**+R**12**|/|R**11**−R**12**|=2.11. The radius of curvature R**11** of the object-side surface S**11** of the sixth lens E**6** and the radius of curvature R**12** of the image-side surface S**12** of the sixth lens E**6** also satisfy: R**12**/R**11**=2.80. The center thickness CT**4** of the fourth lens E**4** on the optical axis and the center thickness CT**5** of the fifth lens E**5** on the optical axis satisfy: CT**4**/CT**5**=2.33. The sum of the center thickness ΣCT of each of the first lens E**1** to the seventh lens E**7** on the optical axis and the axial distance TTL from the center of the object-side surface S**1** of the first lens E**1** to the image plane S**17** of the camera lens group satisfy: ΣCT/TTL=0.55. The spacing distance T**67** between the sixth lens E**6** and the seventh lens E**7** on the optical axis and the spacing distance T**56** between the fifth lens E**5** and the sixth lens E**6** on the optical axis satisfy: T**67**/T**56**=9.29.

In the present embodiment, the aspheric lens may be used for each lens, and the surface type x of each aspheric surface is defined by the following formula:

Here, x is the sag—the axis-component of the displacement of the surface from the aspheric vertex, when the surface is at height h from the optical axis; c is the paraxial curvature of the aspheric surface, and c=1/R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient (given in Table 1 above); and Ai is the correction coefficient of the i^{th }order of the aspheric surface. Table 2 below shows the high-order coefficients A_{4}, A_{6}, A_{8}, A_{10}, A_{12}, A_{14}, A_{16}, A_{18}, and A_{20 }applicable to the aspheric surfaces S**1**-S**14** in the first embodiment.

Table 3 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL (i.e., the axial distance from the center of the object-side surface S**1** of the first lens E**1** to the image plane S**17**), and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the first embodiment.

As may be known from Table 1 and Table 3, the effective focal length f**2** of the second lens E**2** and the total effective focal length f of the camera lens group satisfy: f**2**/f=1.40. The effective focal length f**4** of the fourth lens E**4** and the effective focal length f**6** of the sixth lens E**6** satisfy: f**4**/f**6**=1.72. The effective focal length f**7** of the seventh lens E**7** and the effective focal length f**2** of the second lens E**2** satisfy: f**7**/f**2**=−1.04. The axial distance TTL from the object-side surface S**1** of the first lens E**1** to the image plane S**17** and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** satisfy: TTL/ImgH=1.50. The total effective focal length f of the camera lens group and the radius of curvature R**9** of the object-side surface S**9** of the fifth lens E**5** satisfy: f/R**9**=−2.10. The effective focal length f**5** of the fifth lens E**5** and the radius of curvature R**10** of the image-side surface S**10** of the fifth lens E**5** satisfy: f**5**/R**10**=1.26.

In the present embodiment, the total effective focal length f of the camera lens group and the entrance pupil diameter EPD of the camera lens group satisfy: f/EPD=1.59, and the camera lens group has a large aperture.

**Second Embodiment**

A camera lens group according to the second embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

The first lens E**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a concave surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

The second lens E**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a convex surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

The third lens E**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

The fourth lens E**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a concave surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

The fifth lens E**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a convex surface, an image-side surface S**10** of the fifth lens E**5** is a concave surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

The sixth lens E**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

The seventh lens E**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a concave surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

Optionally, the camera lens group may further include an optical filter E**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

Optionally, the camera lens group may further include a diaphragm STO disposed between the first lens E**1** and the second lens E**2**, to improve the imaging quality.

Table 2 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the second embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 5 shows the high-order coefficients applicable to each aspheric surface in the second embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 6 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the second embodiment.

**4**D shows the lateral color curve of the camera lens group according to the second embodiment, representing deviations of different image heights on the image plane after light passes through the lens group. It can be seen from

**Third Embodiment**

A camera lens group according to the third embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

The first lens E**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a concave surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

The second lens E**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a convex surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

The third lens E**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

The fourth lens E**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a concave surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

The fifth lens E**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a convex surface, an image-side surface S**10** of the fifth lens E**5** is a concave surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

The sixth lens E**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

The seventh lens E**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a concave surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

Optionally, the camera lens group may further include an optical filter E**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

Optionally, the camera lens group may further include a diaphragm STO disposed between the first lens E**1** and the second lens E**2**, to improve the imaging quality.

Table 7 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the third embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 8 shows the high-order coefficients applicable to each aspheric surface in the third embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 9 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the third embodiment.

**Fourth Embodiment**

A camera lens group according to the fourth embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

The first lens E**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a convex surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

The second lens E**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a convex surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

The third lens E**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

The fourth lens E**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a concave surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

The fifth lens E**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a convex surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

The seventh lens E**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a concave surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 10 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the fourth embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 11 shows the high-order coefficients applicable to each aspheric surface in the fourth embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 12 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the fourth embodiment.

**Fifth Embodiment**

A camera lens group according to the fifth embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

The first lens E**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a convex surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a convex surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a concave surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

The fifth lens E**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a convex surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a concave surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 13 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the fifth embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 14 shows the high-order coefficients applicable to each aspheric surface in the fifth embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 15 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the fifth embodiment.

**Sixth Embodiment**

A camera lens group according to the sixth embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

The first lens E**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a concave surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a convex surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a concave surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

The fifth lens E**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a concave surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a concave surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 16 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the sixth embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 17 shows the high-order coefficients applicable to each aspheric surface in the sixth embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 18 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the sixth embodiment.

**Seventh Embodiment**

A camera lens group according to the seventh embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a convex surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a convex surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a concave surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

The fifth lens E**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a concave surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a concave surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 19 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the seventh embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 20 shows the high-order coefficients applicable to each aspheric surface in the seventh embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 21 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the seventh embodiment.

**Eighth Embodiment**

A camera lens group according to the eighth embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a concave surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a convex surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

The third lens E**3** has a positive refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a concave surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

The fifth lens E**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a concave surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a concave surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 22 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the eighth embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 23 shows the high-order coefficients applicable to each aspheric surface in the eighth embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 24 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the eighth embodiment.

**Ninth Embodiment**

A camera lens group according to the ninth embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a convex surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

The second lens E**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a concave surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

The fourth lens E**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a convex surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a convex surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

The seventh lens E**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a convex surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 25 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the ninth embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 26 shows the high-order coefficients applicable to each aspheric surface in the ninth embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 27 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the ninth embodiment.

**Tenth Embodiment**

A camera lens group according to the tenth embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

**1** has a negative refractive power, an object-side surface S**1** of the first lens E**1** is a convex surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

The second lens E**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a concave surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

The fourth lens E**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a convex surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a convex surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

The seventh lens E**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a convex surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 28 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the tenth embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 29 shows the high-order coefficients applicable to each aspheric surface in the tenth embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 30 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the tenth embodiment.

**Eleventh Embodiment**

A camera lens group according to the eleventh embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

The first lens E**1** has a positive refractive power, an object-side surface S**1** of the first lens E**1** is a convex surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a concave surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a convex surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a convex surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a convex surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 31 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the eleventh embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 32 shows the high-order coefficients applicable to each aspheric surface in the eleventh embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 33 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the eleventh embodiment.

**Twelfth Embodiment**

A camera lens group according to the twelfth embodiment of the present disclosure is described below with reference to

As shown in **1**, a second lens E**2**, a third lens E**3**, a fourth lens E**4**, a fifth lens E**5**, a sixth lens E**6**, a seventh lens E**7**, and an image plane S**17**.

The first lens E**1** has a positive refractive power, an object-side surface S**1** of the first lens E**1** is a convex surface, an image-side surface S**2** of the first lens E**1** is a concave surface, and the object-side surface S**1** and the image-side surface S**2** of the first lens E**1** are both aspheric surfaces.

**2** has a positive refractive power, an object-side surface S**3** of the second lens E**2** is a convex surface, an image-side surface S**4** of the second lens E**2** is a concave surface, and the object-side surface S**3** and the image-side surface S**4** of the second lens E**2** are both aspheric surfaces.

**3** has a negative refractive power, an object-side surface S**5** of the third lens E**3** is a convex surface, an image-side surface S**6** of the third lens E**3** is a concave surface, and the object-side surface S**5** and the image-side surface S**6** of the third lens E**3** are both aspheric surfaces.

**4** has a positive refractive power, an object-side surface S**7** of the fourth lens E**4** is a convex surface, an image-side surface S**8** of the fourth lens E**4** is a convex surface, and the object-side surface S**7** and the image-side surface S**8** of the fourth lens E**4** are both aspheric surfaces.

**5** has a negative refractive power, an object-side surface S**9** of the fifth lens E**5** is a concave surface, an image-side surface S**10** of the fifth lens E**5** is a convex surface, and the object-side surface S**9** and the image-side surface S**10** of the fifth lens E**5** are both aspheric surfaces.

**6** has a positive refractive power, an object-side surface S**11** of the sixth lens E**6** is a convex surface, an image-side surface S**12** of the sixth lens E**6** is a concave surface, and the object-side surface S**11** and the image-side surface S**12** of the sixth lens E**6** are both aspheric surfaces.

**7** has a negative refractive power, an object-side surface S**13** of the seventh lens E**7** is a convex surface, an image-side surface S**14** of the seventh lens E**7** is a concave surface, and the object-side surface S**13** and the image-side surface S**14** of the seventh lens E**7** are both aspheric surfaces.

**8** having an object-side surface S**15** and an image-side surface S**16**. Light from an object passes through the surfaces S**1** to S**16** sequentially and is finally imaged on the image plane S**17**.

**1** and the second lens E**2**, to improve the imaging quality.

Table 34 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the camera lens group in the twelfth embodiment. The radius of curvature and the thickness are shown in millimeters (mm). Table 35 shows the high-order coefficients applicable to each aspheric surface in the twelfth embodiment. The surface type of each aspheric surface may be defined by the formula (1) given in the above the first embodiment. Table 36 shows the effective focal lengths f**1**-f**7** of the lenses, the total effective focal length f of the camera lens group, the total track length TTL, and the half of the diagonal length ImgH of the effective pixel area on the image plane S**17** in the twelfth embodiment.

To sum up, the first embodiment to the twelfth embodiment respectively satisfy the relationships shown in Table 37 below.

The present disclosure further provides a camera device, having a photosensitive element which may be a photosensitive charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) element. The camera device may be an independent camera device such as a digital camera, or may be a camera module integrated in a mobile electronic device such as a mobile phone. The camera device is equipped with the camera lens group described above.

The foregoing is only a description for the preferred embodiments of the present disclosure and the applied technical principles. It should be appreciated by those skilled in the art that the inventive scope of the present disclosure is not limited to the technical solution formed by the particular combinations of the above technical features. The inventive scope should also cover other technical solutions formed by any combinations of the above technical features or equivalent features thereof without departing from the concept of the invention, for example, technical solutions formed by replacing the features as disclosed in the present disclosure with (but not limited to) technical features with similar function.

## Claims

1. A camera lens group comprising, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers, wherein,

- the second lens has a positive refractive power, and an object-side surface of the second lens is a convex surface;

- an object-side surface of the third lens is a convex surface, and an image-side surface of the third lens is a concave surface;

- an object-side surface of the sixth lens is a convex surface, and an image-side surface of the sixth lens is a concave surface;

- an image-side surface of the seventh lens is a concave surface; and

- a center thickness CT4 of the fourth lens on the optical axis and a center thickness CT5 of the fifth lens on the optical axis satisfy: CT4/CT5>1.5.

2. The camera lens group according to claim 1, wherein a total effective focal length f of the camera lens group and an entrance pupil diameter EPD of the camera lens group satisfy: f/EPD1.65.

3. The camera lens group according to claim 1, wherein an effective focal length f2 of the second lens and the total effective focal length f of the camera lens group satisfy: 0.5<f2/f<1.5.

4. The camera lens group according to claim 1, wherein the seventh lens has a negative refractive power, and an effective focal length f7 of the seventh lens and an effective focal length f2 of the second lens satisfy: −1.5<f7/f2<−0.5.

5. The camera lens group according to claim 1, wherein a radius of curvature R6 of the image-side surface of the third lens and a radius of curvature R4 of an image-side surface of the second lens satisfy: −0.5<R6/R4<0.8.

6. The camera lens group according to claim 1, wherein a radius of curvature R7 of an object-side surface of the fourth lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy: 0<(R7+R8)/(R7−R8)≤1.5.

7. The camera lens group according to claim 1, wherein a total effective focal length f of the camera lens group and a radius of curvature R9 of an object-side surface of the fifth lens satisfy: −3.5<f/R9<0.5.

8. The camera lens group according to claim 1, wherein an effective focal length f5 of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy: −2<f5/R10<22.

9. The camera lens group according to claim 1, wherein a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 1.5<|R11+R12|/|R11−R12|<3.5.

10. The camera lens group according to claim 1, wherein a radius of curvature R12 of the image-side surface of the sixth lens and a radius of curvature R11 of the object-side surface of the sixth lens satisfy: 1.5<R12/R11<4.0.

11. The camera lens group according to claim 1, wherein a spacing distance T67 between the sixth lens and the seventh lens on the optical axis and a spacing distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: 4<T67/T56<14.

12. The camera lens group according to claim 1, wherein a sum of center thickness ΣCT of each of the first lens to the seventh lens on the optical axis and an axial distance TTL from an object-side surface of the first lens to an image plane of the camera lens group satisfy: 0.5≤ΣCT/TTL≤0.7.

13. The camera lens group according to claim 1, wherein an axial distance TTL from an object-side surface of the first lens to an image plane of the camera lens group and half of a diagonal length ImgH of an effective pixel area on the image plane of the camera lens group satisfy: TTL/ImgH≤1.60.

14. A camera lens group comprising, sequentially along an optical axis from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers, wherein,

- an object-side surface of the second lens is a convex surface;

- an object-side surface of the third lens is a convex surface, and an image-side surface of the third lens is a concave surface;

- an object-side surface of the sixth lens is a convex surface, and an image-side surface of the sixth lens is a concave surface;

- an image-side surface of the seventh lens is a concave surface; and

- an effective focal length f4 of the fourth lens and an effective focal length f6 of the sixth lens satisfy: 0.5<f4/f6<2.

15. The camera lens group according to claim 14, wherein an effective focal length f2 of the second lens and a total effective focal length f of the camera lens group satisfy: 0.5<f2/f<1.5.

16. The camera lens group according to claim 14, wherein the seventh lens has a negative refractive power, and an effective focal length f7 of the seventh lens and an effective focal length f2 of the second lens satisfy: −1.5<f7/f2<−0.5.

17. The camera lens group according to claim 14, wherein a radius of curvature R6 of the image-side surface of the third lens and a radius of curvature R4 of an image-side surface of the second lens satisfy: −0.5<R6/R4<0.8.

18. The camera lens group according to claim 14, wherein the total effective focal length f of the camera lens group and an entrance pupil diameter EPD of the camera lens group satisfy: f/EPD≤1.65.

19. The camera lens group according to claim 14, wherein a sum of center thickness ΣCT of each of the first lens to the seventh lens on the optical axis and an axial distance TTL from an object-side surface of the first lens to an image plane of the camera lens group satisfy: 0.5≤ΣCT/TTL≤0.7.

20. The camera lens group according to claim 19, wherein a spacing distance T67 between the sixth lens and the seventh lens on the optical axis and a spacing distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: 4<T67/T56<14.

**Patent History**

**Publication number**: 20190170966

**Type:**Application

**Filed**: Feb 12, 2019

**Publication Date**: Jun 6, 2019

**Patent Grant number**: 11092770

**Inventors**: Jianke Wenren (Ningbo City), Ming Li (Ningbo City), Saifeng Lyu (Ningbo City), Lihui YE (Ningbo City)

**Application Number**: 16/273,839

**Classifications**

**International Classification**: G02B 7/02 (20060101); G02B 9/64 (20060101); H04N 5/225 (20060101); G02B 27/00 (20060101);